Steam-engine indicator.



Patented Nov. 26, lem. c. B. oswuRTH.

STEAM ENGINE INDICATOR.

(Application led Mar. 15, 1901.)

2l Sheets-Sheet I.

(No Model.)

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N0. 687,39|.` Patented NOV. 26, |90I. C. B. BOSWORTH.

STEAM ENGINE INDICATOR` (Application filed Mar. 15, 1901.)

2 Sheets-Sheet 2.

(No Model.)

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ms a1-ans wp mamme wAsmvmnN n L UNITED STATES PATENT OFFICE.

CHARLES B. BOSWORTH, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO STARBRASS MANUFACTURING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

STEAM-ENGINE INDICATOR..

SPECIFlCATION forming part of Letters Patent No. 687,391, dated November26, 1901.

Application filed March 15, 1901. Serial No. 51,227. (No model.)

T @ZZ wwm/ 15 may mwt: ing on the upper side of the plate A to any 5oBeit known that LCHARLES B. BOSWORTH, desired extent. It is providedwith the screwacitzen of the United States, residing at Somthreadedsection 3, which engages the thread erville, in the county of Middlesexand State ed section a6 of the casing c, the seat b", which ofMassachusetts, have invented a new and comes in contact with `the seata2 of the casuseful Improvement in Steam-Engine Indicaing when thecylinder has been fullyscrewed 55 tors, of which the following isa full,clear, and to place in the casing, the holes b5, which coneXactdescription, reference being had to the nect its interior chamber babove the piston accompanying drawings, forming a part of with theannular channel a4, J[he threaded 1o this speciiication,in explainingits nature. section 117 at its outer end, with which the The inventionrelates to asteam-engine inthreaded portion bs of the cap b' engages,and 6o dicator having a base or support provided it is further shapedwith respect to the casing with an integral cylinder-holder and to the ato provide the long narrow jacket-forming form of cylinder combinedtherewith. chamber U between it and the casing a and It further relatesto means for the adjustwhich is constantly connected with the sourcement of the pencil from Without the cylinder of steam-supply or power.65 and to details of construction which will here- A sleeve C surroundsthe uncovered porinafter be described. tion of the cylinder on the upperside of the Referring to the drawings, Figure 1 is a plate and furnishessupports for the link-ear zo view ofa steam-engine.indicatorhaving somec and the link-post c. It is held against the of the features ofmyinvention part in elevashoulderof the cylinder which forms the seat 7otion and part in section. Fig. 2 is a detail l)`1 by an extension of thecap b'. view, enlarged,ofanadjustable swivelingcon- The pencil.-lever Dis pivoted at d to the nection between the piston-rod and the penlinkd', which is itself pivoted'to an ear c, fast cil-lever. Fig. 3 is aviewillustratinga gearto the sleeve C. The pencil-lever is also piving-downor reducing mechanism. Fig. 4: is oted at d2 upon a link d3, whichitself is piv- 75 a plan thereof inverted. Figs. 5 and 6 repoted to theupper end of the post c, mounted resent a paper-drum clutch, to whichreferupon an extension from said sleeve C. The ence is hereinafter made.pencil-lever is connected to the piston-rod d2 3o In the drawings, Aisthe plate of the indioutside the cylinder and above the cap b' by cator.It has at one end, extending princi-v a link d", which is pivotallyconnected to the 8o pally from its under or back side, an integralpencil-lever between its pivotal points d and cylindrical casing a,which has at its lower d2 and upon the line of movement of the pisend acoupling a and at its upper end aseat tou-rod, and also to the upper endof a coupa2. It forms a continuons chamber a3, open ling d5, whichconnects the link d'L with the at both ends and cylindricalin shape. Ithas end of the piston, and which coupling not 85 in its interioradjacent to the seat d2 the anonly forms a swivel-jointed connectionbenular channel 01.4, which is connected at one tween the link atl andthe piston-rod, but also side with the outer air by the diagonal holesmeans whereby the distance between the link 4o or passages ai, whichextend from the chand4 and the piston-rod may be varied or adneldiagonally through the casing. (See Fig. justed at will upon the outsideo the cylin- 9o 1.) Adjacent to the annular channel is the der andwithout the removal of any part of interior screw-threaded section a6.the indicator and for the purpose ot' permit- B is the cylinder, inwhich the piston b ltingthe adjustment of the position of the penmovesand which also serves to hold the cap cil d@ at the outer end of thepencil-lever D b, which furnishes the guide for the pistonalong the sideof the drum D', upon which 95 rod b2. The cylinder is of a length toextend the indicator-card is mounted. The pistoninto the chamber as ofthe casing Ct almostits rod is provided with a long threaded hole di,entire length and to also extend from thecasextending from its outerend. The coupling d5 has a long threaded stem d" vto enter the threadedhole in the piston-rod. Its outer end is enlarged and provided with ahole dw, an exterior screw-thread d, and a seat d. A cap C113, having arecess d, screws onto the enlargement and serves to secure to it amember d15 ot a swivel-joint, which comprises a pivot di to iit the holed10 and a collar d1? to extend into the recess of the cap between it andthe seat dn. The upper end of this joint member d15 is provided withears, between which the pencil-lever link dl is pivoted. The swivelconnection is above and beyond the upper end of the cylinder, and aportion of it forms the end of the adjusting device or connection withthe piston-rod, and thereby provides means by which the adjusting devicemay be actuated by hand outside the cylinder without requiring theremoval in any way ot' any part of the indicator, thus permitting theadjustment of the pencil to be instantly made at will without varyingany other relation between it and the piston-rod.

In Fig. l thev drum is represented as not geared down. In Fig. 5 it isshown as pro vided with a clutch which is engageable at will with thecord-spool f. It comprises the holderf, having a recess f2 toward thespool f of a size to receive a clutch-ball F and permitit to movetangentially with respect to the surface ofthe spool. A spring f3 bearsagainst the ball and keeps it in contact with a controller f4. Thiscontroller is in the shape of a plate which is movable toward and fromthe holderf by screwing or unscrewing the stud or handle f5. The partialunscrewing of the handle permits the controller to be moved away fromthe holder sufficiently to allow the ball to engage with the spool andthen act as a clutch in preventing the spool from turning backward. Itis of course free to be moved in the reverse direction. By turning thehandle in the reverse direction and moving the controller against theholder the ball is removable from the spool to an inactive position andthe spool is no longer engaged by a clutch. The side f6 of the recess f2may be slightly inclined away from the periphery of the spool, asrepresented in Fig. 5. This makes the engagement and disengagement ofthe ball obtainable in a very short movement of it in one direction orthe other.

In Fig. 3 I have shown the drum as geared down by mechanism comprisingthe gear G at the base of the drum, the pinion g, to mesh with it,mounted upon the upper end of the shaft g', and the cord-spool g2,fastened to the shaft g. The shaft is supported by the bracket g3,attachable to and detachable from the plate A by a drum-clamping screwg4.

It will be seen that the construction of cylinder shown and describedprovides fora perfeet alinement of the piston and piston-rod bearing, asthe piston-rod bearing is attached directly to an integral extension ofthe cylinder, so that the piston-rod bearing is directlyT connected withthe cylinder. rlhis construction is of value in the manufacture ol' thispart of the instrument and also in the subsequent use and wear of it.The way in which the cylinder and piston rod bearing are mounted uponthe plate is also of importance, because of the simplicity and firmnessor rigidity ot the support and also because of the nature of theexhaust-channel and-its connections with the outer air and the manner inwhich the steamjacket about the cylinder is provided, the whole beingobtained by a direct application of correct principles of constructionwhich cheapen the construction, improve the operation, and lengthen theoperation ot the indicator.

Having thus fully described my invention, I claim and desire to secureby Letters Patent of the United Statesl. In a steam-engine indicator,the combination of a supporting-plate provided with an integralcylinderholder extending mainly from the lower side of the plate andhaving an open end surrounded by a seat and an interior threaded sectionadjacent to the seat, with a cylinder, a portion ol which is containedin said holder and a portion of which extends from it, which cylinderhas a shoulderto bear against the seat, an interior threaded section toengage the threaded section of the holder, and an extension from thethreaded section in the holder sufficiently less in size than the boreof the part of the holder against it to form a continuous chambersurrounding the cylinder and connected with the chamber of the holderbelow the cylinder thereby forming an extension of said chainber aboutthe cylinder adapted. to receive and contain a live-steam jacket for thecylinder.

2. In a steam-engine, the combination of the base-plate, an integralcylinder-holder extending from said base-plate, having an open endsurrounded by a seat, an annular channel adjacent to said seat openingto the outer air, and a threaded section adjacent to the annularchannel, with a cylinder having a portion contained in the saidcylinderholder, provided with a shoulder to bear against the seat,perforations against said annular channel and opening into it throughwhich spent steam may escape, a threaded section to engage the threadedpart of the holder, and an extension of the cylinderinto the holder fromsaid threaded end supported entirely from said threaded section andproviding between it and the holder an unobstructed chamber connectingwith the steam- IOO IIO

cylinder, a portion of which is contained in the holder and a portion ofwhich extends from the holder and serves as a support for the piston-rodand pencil-lever arms, the said cylinder also having a shoulder to bearagainst said seat, a perforated section against said channel throughwhich spent steam may escape, a threaded section to engage the threadedsection of the holder, and an extension into the live-steam chamber ofthe holder separated from the Wall of the holder by an annular chamberconnected only With the live-steam chamber, and the piston, piston-rod,pencillever connected with the piston-rod, and the paper drum.

4. In a steam-engine indicator, the combination of a plate provided withan integral cylinder-holder upon one side, a cylinder and apiston-rodbearing support, a portion of which is contained Within saidholder and is attached thereto by interior threaded connections and anexterior shoulder' and seat, and a portion of which projects fro mv saidcylinderholder and furnishes a support for a pistonrod bearing and forthe sleeve of apost-holding bracket, said piston-rod bearing, saidsleeved post-holding bracket, a piston, a piston-rod, a pencil-lever,and means for connecting it with said piston-rod, said means consistingof a threaded stem adjustably attached to the piston-rod and the outerend of Which forms one member of a coupling, another member of thecoupling adapted to turn in said stem-coupling and a link hinged to saidturning coupling and to said pencillever as described.

5. In a steam-engine indicator comprising a piston and a cylinder, apiston-rod and a pencil-lever, an adjustable means connecting saidpencil-lever with said piston-rod comprising a threaded stem adj ustablymounted on the piston-rod and formed at its outer end outside thecylindercap to provide a member of a coupling, a cooperating member ofthe coupling adapted to turn in the said firstnamed member and a linkconnecting said cooperating member of the coupling with saidpencil-lever and whereby upon turning the stem member of the couplingthe distance between said pencil-lever and said piston may be variedfrom outside of the said cylinder Without disturbing said piston, as andfor the purposes set forth.

G. The combination in a steam-engine indicator of the drum-spooland aclutch mounted upon the plate A and adjustable thereon to an operativeor an inoperative position.

'7. The combination in a steam-engine indicator of the drum-spool, theplate upon which it is mounted,a clutch carried upon said plate,comprising a holder fixed to the plate, having a tangential recessadjacent to the periphery of the spool, a roll or ball movablelengthwise said recess, a spring for moving it in one direction and anadjustable controller for limiting the extent of its movement, wherebyit may be allowed to take an operative position or may be restrainedfrom operation.

8. The combination in a steam-engine indicator, of a drum having agear'mounted upon its lower end of substantially equal diametertherewith, a bracket attached to the drum-plate carrying a shaft havinga pinion at its upper end to engage said gear and also carrying acord-drum of greater diameter than said pinion, as and for the purposesdescribed.

CHARLES B. BOSWORTH. Witnesses:

F. F. RAYMOND, 2d, JOHN E. R. HAYES.

